616388614381 has 2 divisors, whose sum is σ = 616388614382. Its totient is φ = 616388614380.

The previous prime is 616388614349. The next prime is 616388614423. The reversal of 616388614381 is 183416883616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594917573481 + 21471040900 = 771309^2 + 146530^2 .

It is a cyclic number.

It is not a de Polignac number, because 616388614381 - 2⁵ = 616388614349 is a prime.

It is a super-2 number, since 2×616388614381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616388614181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308194307190 + 308194307191.

It is an arithmetic number, because the mean of its divisors is an integer number (308194307191).

Almost surely, 2^616388614381 is an apocalyptic number.

It is an amenable number.

616388614381 is a deficient number, since it is larger than the sum of its proper divisors (1).

616388614381 is an equidigital number, since it uses as much as digits as its factorization.

616388614381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 55.

The spelling of 616388614381 in words is "six hundred sixteen billion, three hundred eighty-eight million, six hundred fourteen thousand, three hundred eighty-one".