1551505220656 has 10 divisors (see below), whose sum is σ = 3006041365052. Its totient is φ = 775752610320.

The previous prime is 1551505220651. The next prime is 1551505220701. The reversal of 1551505220656 is 6560225051551.

It is not an unprimeable number, because it can be changed into a prime (1551505220651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48484538130 + ... + 48484538161.

Almost surely, 2^{1551505220656} is an apocalyptic number.

1551505220656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1551505220656 is a deficient number, since it is larger than the sum of its proper divisors (1454536144396).

1551505220656 is an equidigital number, since it uses as much as digits as its factorization.

1551505220656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96969076299 (or 96969076293 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 1551505220656 in words is "one trillion, five hundred fifty-one billion, five hundred five million, two hundred twenty thousand, six hundred fifty-six".