74787955978717 has 2 divisors, whose sum is σ = 74787955978718. Its totient is φ = 74787955978716.

The previous prime is 74787955978699. The next prime is 74787955978727. The reversal of 74787955978717 is 71787955978747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51607255424761 + 23180700553956 = 7183819^2 + 4814634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74787955978717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74787955978727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37393977989358 + 37393977989359.

It is an arithmetic number, because the mean of its divisors is an integer number (37393977989359).

Almost surely, 2^{74787955978717} is an apocalyptic number.

It is an amenable number.

74787955978717 is a deficient number, since it is larger than the sum of its proper divisors (1).

74787955978717 is an equidigital number, since it uses as much as digits as its factorization.

74787955978717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60989241600, while the sum is 91.

The spelling of 74787955978717 in words is "seventy-four trillion, seven hundred eighty-seven billion, nine hundred fifty-five million, nine hundred seventy-eight thousand, seven hundred seventeen".