151516821397 has 2 divisors, whose sum is σ = 151516821398. Its totient is φ = 151516821396.

The previous prime is 151516821361. The next prime is 151516821427. The reversal of 151516821397 is 793128615151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138020423121 + 13496398276 = 371511^2 + 116174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151516821397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 151516821397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151516821497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75758410698 + 75758410699.

It is an arithmetic number, because the mean of its divisors is an integer number (75758410699).

Almost surely, 2^151516821397 is an apocalyptic number.

It is an amenable number.

151516821397 is a deficient number, since it is larger than the sum of its proper divisors (1).

151516821397 is an equidigital number, since it uses as much as digits as its factorization.

151516821397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 49.

The spelling of 151516821397 in words is "one hundred fifty-one billion, five hundred sixteen million, eight hundred twenty-one thousand, three hundred ninety-seven".