623421537616 has 10 divisors (see below), whose sum is σ = 1207879229162. Its totient is φ = 311710768800.

The previous prime is 623421537569. The next prime is 623421537631. The reversal of 623421537616 is 616735124326.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 588601977616 + 34819560000 = 767204^2 + 186600^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19481923035 + ... + 19481923066.

Almost surely, 2^623421537616 is an apocalyptic number.

It is an amenable number.

623421537616 is a deficient number, since it is larger than the sum of its proper divisors (584457691546).

623421537616 is a wasteful number, since it uses less digits than its factorization.

623421537616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38963846109 (or 38963846103 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 46.

The spelling of 623421537616 in words is "six hundred twenty-three billion, four hundred twenty-one million, five hundred thirty-seven thousand, six hundred sixteen".