1551500061651 has 12 divisors (see below), whose sum is σ = 2258162941320. Its totient is φ = 1026437699040.

The previous prime is 1551500061647. The next prime is 1551500061689. The reversal of 1551500061651 is 1561600051551.

It is a happy number.

1551500061651 is a `hidden beast` number, since 1 + 551 + 50 + 0 + 0 + 6 + 1 + 6 + 51 = 666.

It is not a de Polignac number, because 1551500061651 - 2² = 1551500061647 is a prime.

It is a super-3 number, since 3×1551500061651³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1551500261651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 657971706 + ... + 657974063.

It is an arithmetic number, because the mean of its divisors is an integer number (188180245110).

Almost surely, 2^{1551500061651} is an apocalyptic number.

1551500061651 is a deficient number, since it is larger than the sum of its proper divisors (706662879669).

1551500061651 is a wasteful number, since it uses less digits than its factorization.

1551500061651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315945906 (or 1315945903 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 1551500061651 in words is "one trillion, five hundred fifty-one billion, five hundred million, sixty-one thousand, six hundred fifty-one".