100651121620561 has 2 divisors, whose sum is σ = 100651121620562. Its totient is φ = 100651121620560.

The previous prime is 100651121620537. The next prime is 100651121620571. The reversal of 100651121620561 is 165026121156001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59911547465025 + 40739574155536 = 7740255^2 + 6382756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100651121620561 is a prime.

It is a super-3 number, since 3×100651121620561³ (a number of 43 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100651121620561.

It is not a weakly prime, because it can be changed into another prime (100651121620501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50325560810280 + 50325560810281.

It is an arithmetic number, because the mean of its divisors is an integer number (50325560810281).

Almost surely, 2^{100651121620561} is an apocalyptic number.

It is an amenable number.

100651121620561 is a deficient number, since it is larger than the sum of its proper divisors (1).

100651121620561 is an equidigital number, since it uses as much as digits as its factorization.

100651121620561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

Adding to 100651121620561 its reverse (165026121156001), we get a palindrome (265677242776562).

The spelling of 100651121620561 in words is "one hundred trillion, six hundred fifty-one billion, one hundred twenty-one million, six hundred twenty thousand, five hundred sixty-one".