151210021661 has 2 divisors, whose sum is σ = 151210021662. Its totient is φ = 151210021660.

The previous prime is 151210021639. The next prime is 151210021763. The reversal of 151210021661 is 166120012151.

151210021661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150148500100 + 1061521561 = 387490^2 + 32581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151210021661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 151210021661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151210023661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75605010830 + 75605010831.

It is an arithmetic number, because the mean of its divisors is an integer number (75605010831).

Almost surely, 2^151210021661 is an apocalyptic number.

It is an amenable number.

151210021661 is a deficient number, since it is larger than the sum of its proper divisors (1).

151210021661 is an equidigital number, since it uses as much as digits as its factorization.

151210021661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 151210021661 in words is "one hundred fifty-one billion, two hundred ten million, twenty-one thousand, six hundred sixty-one".