74154367921 has 2 divisors, whose sum is σ = 74154367922. Its totient is φ = 74154367920.

The previous prime is 74154367891. The next prime is 74154367927. The reversal of 74154367921 is 12976345147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63146161521 + 11008206400 = 251289^2 + 104920^2 .

It is a cyclic number.

It is not a de Polignac number, because 74154367921 - 2¹⁹ = 74153843633 is a prime.

It is not a weakly prime, because it can be changed into another prime (74154367927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37077183960 + 37077183961.

It is an arithmetic number, because the mean of its divisors is an integer number (37077183961).

Almost surely, 2^74154367921 is an apocalyptic number.

It is an amenable number.

74154367921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74154367921 is an equidigital number, since it uses as much as digits as its factorization.

74154367921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 49.

The spelling of 74154367921 in words is "seventy-four billion, one hundred fifty-four million, three hundred sixty-seven thousand, nine hundred twenty-one".