61151199581 has 4 divisors (see below), whose sum is σ = 61182869664. Its totient is φ = 61119529500.

The previous prime is 61151199569. The next prime is 61151199587. The reversal of 61151199581 is 18599115116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61151199581 - 2¹⁸ = 61150937437 is a prime.

It is a super-2 number, since 2×61151199581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61151199587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15832145 + ... + 15836006.

It is an arithmetic number, because the mean of its divisors is an integer number (15295717416).

Almost surely, 2^61151199581 is an apocalyptic number.

It is an amenable number.

61151199581 is a deficient number, since it is larger than the sum of its proper divisors (31670083).

61151199581 is a wasteful number, since it uses less digits than its factorization.

61151199581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31670082.

The product of its digits is 97200, while the sum is 47.

The spelling of 61151199581 in words is "sixty-one billion, one hundred fifty-one million, one hundred ninety-nine thousand, five hundred eighty-one".