1621286775072 has 120 divisors (see below), whose sum is σ = 4768702058736. Its totient is φ = 540367417728.

The previous prime is 1621286775061. The next prime is 1621286775089. The reversal of 1621286775072 is 2705776821261.

1621286775072 is a `hidden beast` number, since 1 + 6 + 2 + 128 + 6 + 7 + 7 + 507 + 2 = 666.

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

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, 26581603 + ... + 26642525.

Almost surely, 2^{1621286775072} is an apocalyptic number.

1621286775072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621286775072 is an abundant number, since it is smaller than the sum of its proper divisors (3147415283664).

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

1621286775072 is a wasteful number, since it uses less digits than its factorization.

1621286775072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71212 (or 71195 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 54.

The spelling of 1621286775072 in words is "one trillion, six hundred twenty-one billion, two hundred eighty-six million, seven hundred seventy-five thousand, seventy-two".