57280766615661 has 16 divisors (see below), whose sum is σ = 78151165283840. Its totient is φ = 37298787891120.

The previous prime is 57280766615641. The next prime is 57280766615671. The reversal of 57280766615661 is 16651666708275.

It is not a de Polignac number, because 57280766615661 - 2¹⁷ = 57280766484589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 57280766615592 and 57280766615601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57280766615641) 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, 13919760 + ... + 17559078.

It is an arithmetic number, because the mean of its divisors is an integer number (4884447830240).

Almost surely, 2^{57280766615661} is an apocalyptic number.

It is an amenable number.

57280766615661 is a deficient number, since it is larger than the sum of its proper divisors (20870398668179).

57280766615661 is a wasteful number, since it uses less digits than its factorization.

57280766615661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761376.

The product of its (nonzero) digits is 152409600, while the sum is 66.

The spelling of 57280766615661 in words is "fifty-seven trillion, two hundred eighty billion, seven hundred sixty-six million, six hundred fifteen thousand, six hundred sixty-one".