61378977925657 has 64 divisors (see below), whose sum is σ = 77318436003840. Its totient is φ = 47508557184000.

The previous prime is 61378977925613. The next prime is 61378977925667. The reversal of 61378977925657 is 75652977987316.

It is a cyclic number.

It is not a de Polignac number, because 61378977925657 - 2¹⁵ = 61378977892889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61378977925667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1264661163 + ... + 1264709695.

It is an arithmetic number, because the mean of its divisors is an integer number (1208100562560).

Almost surely, 2^{61378977925657} is an apocalyptic number.

It is an amenable number.

61378977925657 is a deficient number, since it is larger than the sum of its proper divisors (15939458078183).

61378977925657 is a wasteful number, since it uses less digits than its factorization.

61378977925657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50014.

The product of its digits is 8401579200, while the sum is 82.

The spelling of 61378977925657 in words is "sixty-one trillion, three hundred seventy-eight billion, nine hundred seventy-seven million, nine hundred twenty-five thousand, six hundred fifty-seven".