187699624421 has 2 divisors, whose sum is σ = 187699624422. Its totient is φ = 187699624420.

The previous prime is 187699624393. The next prime is 187699624429. The reversal of 187699624421 is 124426996781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152295062500 + 35404561921 = 390250^2 + 188161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187699624421 is a prime.

It is a super-2 number, since 2×187699624421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187699624429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93849812210 + 93849812211.

It is an arithmetic number, because the mean of its divisors is an integer number (93849812211).

Almost surely, 2^187699624421 is an apocalyptic number.

It is an amenable number.

187699624421 is a deficient number, since it is larger than the sum of its proper divisors (1).

187699624421 is an equidigital number, since it uses as much as digits as its factorization.

187699624421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 59.

The spelling of 187699624421 in words is "one hundred eighty-seven billion, six hundred ninety-nine million, six hundred twenty-four thousand, four hundred twenty-one".