61621752056657 has 16 divisors (see below), whose sum is σ = 69310657922688. Its totient is φ = 54358632894720.

The previous prime is 61621752056639. The next prime is 61621752056701. The reversal of 61621752056657 is 75665025712616.

It is a cyclic number.

It is not a de Polignac number, because 61621752056657 - 2³² = 61617457089361 is a prime.

It is a super-2 number, since 2×61621752056657² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61621752056596 and 61621752056605.

It is not an unprimeable number, because it can be changed into a prime (61621752053657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94125128 + ... + 94777545.

It is an arithmetic number, because the mean of its divisors is an integer number (4331916120168).

Almost surely, 2^{61621752056657} is an apocalyptic number.

It is an amenable number.

61621752056657 is a deficient number, since it is larger than the sum of its proper divisors (7688905866031).

61621752056657 is a wasteful number, since it uses less digits than its factorization.

61621752056657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188903800.

The product of its (nonzero) digits is 31752000, while the sum is 59.

The spelling of 61621752056657 in words is "sixty-one trillion, six hundred twenty-one billion, seven hundred fifty-two million, fifty-six thousand, six hundred fifty-seven".