2151558720864 has 120 divisors (see below), whose sum is σ = 7231627983888. Its totient is φ = 614731057920.

The previous prime is 2151558720853. The next prime is 2151558720887. The reversal of 2151558720864 is 4680278551512.

2151558720864 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 558 + 7 + 2 + 0 + 86 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 2151558720864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 59273047 + ... + 59309334.

Almost surely, 2^{2151558720864} is an apocalyptic number.

2151558720864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2151558720864 is an abundant number, since it is smaller than the sum of its proper divisors (5080069263024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151558720864 is a wasteful number, since it uses less digits than its factorization.

2151558720864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118582410 (or 118582393 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 54.

The spelling of 2151558720864 in words is "two trillion, one hundred fifty-one billion, five hundred fifty-eight million, seven hundred twenty thousand, eight hundred sixty-four".