61657205271651 has 36 divisors (see below), whose sum is σ = 103045099753960. Its totient is φ = 35401266172800.

The previous prime is 61657205271559. The next prime is 61657205271653. The reversal of 61657205271651 is 15617250275616.

61657205271651 is a `hidden beast` number, since 6 + 1 + 6 + 57 + 2 + 0 + 527 + 1 + 65 + 1 = 666.

It is not a de Polignac number, because 61657205271651 - 2¹¹ = 61657205269603 is a prime.

It is a super-2 number, since 2×61657205271651² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61657205271653) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1489931590 + ... + 1489972971.

Almost surely, 2^{61657205271651} is an apocalyptic number.

61657205271651 is a deficient number, since it is larger than the sum of its proper divisors (41387894482309).

61657205271651 is a wasteful number, since it uses less digits than its factorization.

61657205271651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979904608 (or 2979904594 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 54.

The spelling of 61657205271651 in words is "sixty-one trillion, six hundred fifty-seven billion, two hundred five million, two hundred seventy-one thousand, six hundred fifty-one".