61551696289 has 8 divisors (see below), whose sum is σ = 65217889800. Its totient is φ = 57890558976.

The previous prime is 61551696263. The next prime is 61551696299. The reversal of 61551696289 is 98269615516.

It can be written as a sum of positive squares in 4 ways, for example, as 38376810000 + 23174886289 = 195900^2 + 152233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61551696289 - 2²³ = 61543307681 is a prime.

It is a super-2 number, since 2×61551696289² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61551696299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1238964 + ... + 1287685.

It is an arithmetic number, because the mean of its divisors is an integer number (8152236225).

Almost surely, 2^61551696289 is an apocalyptic number.

It is an amenable number.

61551696289 is a deficient number, since it is larger than the sum of its proper divisors (3666193511).

61551696289 is a wasteful number, since it uses less digits than its factorization.

61551696289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528099.

The product of its digits is 6998400, while the sum is 58.

The spelling of 61551696289 in words is "sixty-one billion, five hundred fifty-one million, six hundred ninety-six thousand, two hundred eighty-nine".