65557620865 has 8 divisors (see below), whose sum is σ = 85820885568. Its totient is φ = 47678269680.

The previous prime is 65557620841. The next prime is 65557620901. The reversal of 65557620865 is 56802675556.

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

It is not a de Polignac number, because 65557620865 - 2¹¹ = 65557618817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 1191956743 = 65557620865 / (6 + 5 + 5 + 5 + 7 + 6 + 2 + 0 + 8 + 6 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595978317 + ... + 595978426.

It is an arithmetic number, because the mean of its divisors is an integer number (10727610696).

Almost surely, 2^65557620865 is an apocalyptic number.

It is an amenable number.

65557620865 is a deficient number, since it is larger than the sum of its proper divisors (20263264703).

65557620865 is a wasteful number, since it uses less digits than its factorization.

65557620865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191956759.

The product of its (nonzero) digits is 15120000, while the sum is 55.

The spelling of 65557620865 in words is "sixty-five billion, five hundred fifty-seven million, six hundred twenty thousand, eight hundred sixty-five".