74151465721 has 2 divisors, whose sum is σ = 74151465722. Its totient is φ = 74151465720.

The previous prime is 74151465671. The next prime is 74151465749. The reversal of 74151465721 is 12756415147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68834868496 + 5316597225 = 262364^2 + 72915^2 .

It is a cyclic number.

It is not a de Polignac number, because 74151465721 - 2⁹ = 74151465209 is a prime.

It is not a weakly prime, because it can be changed into another prime (74151465761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37075732860 + 37075732861.

It is an arithmetic number, because the mean of its divisors is an integer number (37075732861).

Almost surely, 2^74151465721 is an apocalyptic number.

It is an amenable number.

74151465721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74151465721 is an equidigital number, since it uses as much as digits as its factorization.

74151465721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 235200, while the sum is 43.

The spelling of 74151465721 in words is "seventy-four billion, one hundred fifty-one million, four hundred sixty-five thousand, seven hundred twenty-one".