90851265117649 has 3 divisors (see below), whose sum is σ = 90851274649243. Its totient is φ = 90851255586056.

The previous prime is 90851265117533. The next prime is 90851265117677. The reversal of 90851265117649 is 94671156215809.

The square root of 90851265117649 is 9531593.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 61619595534225 + 29231669583424 = 7849815^2 + 5406632^2 .

It is not a de Polignac number, because 90851265117649 - 2¹⁹ = 90851264593361 is a prime.

It is a super-2 number, since 2×90851265117649² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90851265117689) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4765797 + ... + 14297389.

Almost surely, 2^{90851265117649} is an apocalyptic number.

90851265117649 is the 9531593-rd square number.

90851265117649 is the 4765797-th centered octagonal number.

It is an amenable number.

90851265117649 is a deficient number, since it is larger than the sum of its proper divisors (9531594).

90851265117649 is an frugal number, since it uses more digits than its factorization.

90851265117649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19063186 (or 9531593 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 64.

The spelling of 90851265117649 in words is "ninety trillion, eight hundred fifty-one billion, two hundred sixty-five million, one hundred seventeen thousand, six hundred forty-nine".