37916611669421 has 2 divisors, whose sum is σ = 37916611669422. Its totient is φ = 37916611669420.

The previous prime is 37916611669403. The next prime is 37916611669471. The reversal of 37916611669421 is 12496611661973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29326665468100 + 8589946201321 = 5415410^2 + 2930861^2 .

It is a cyclic number.

It is not a de Polignac number, because 37916611669421 - 2¹⁸ = 37916611407277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37916611669471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18958305834710 + 18958305834711.

It is an arithmetic number, because the mean of its divisors is an integer number (18958305834711).

Almost surely, 2^{37916611669421} is an apocalyptic number.

It is an amenable number.

37916611669421 is a deficient number, since it is larger than the sum of its proper divisors (1).

37916611669421 is an equidigital number, since it uses as much as digits as its factorization.

37916611669421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 62.

The spelling of 37916611669421 in words is "thirty-seven trillion, nine hundred sixteen billion, six hundred eleven million, six hundred sixty-nine thousand, four hundred twenty-one".