100651121620551 has 24 divisors (see below), whose sum is σ = 145442887200000. Its totient is φ = 67074012480912.

The previous prime is 100651121620537. The next prime is 100651121620561. The reversal of 100651121620551 is 155026121156001.

100651121620551 is a `hidden beast` number, since 1 + 0 + 0 + 6 + 5 + 1 + 1 + 21 + 620 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 100651121620551 - 2¹⁸ = 100651121358407 is a prime.

It is a super-3 number, since 3×100651121620551³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100651121620501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 378797620 + ... + 379063238.

It is an arithmetic number, because the mean of its divisors is an integer number (6060120300000).

Almost surely, 2^{100651121620551} is an apocalyptic number.

100651121620551 is a deficient number, since it is larger than the sum of its proper divisors (44791765579449).

100651121620551 is a wasteful number, since it uses less digits than its factorization.

100651121620551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282243 (or 282240 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

Adding to 100651121620551 its reverse (155026121156001), we get a palindrome (255677242776552).

The spelling of 100651121620551 in words is "one hundred trillion, six hundred fifty-one billion, one hundred twenty-one million, six hundred twenty thousand, five hundred fifty-one".