74251247691 has 16 divisors (see below), whose sum is σ = 104761105920. Its totient is φ = 46681736640.

The previous prime is 74251247687. The next prime is 74251247711. The reversal of 74251247691 is 19674215247.

It is not a de Polignac number, because 74251247691 - 2² = 74251247687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74251247691.

It is not an unprimeable number, because it can be changed into a prime (74251247671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7573306 + ... + 7583103.

It is an arithmetic number, because the mean of its divisors is an integer number (6547569120).

Almost surely, 2^74251247691 is an apocalyptic number.

74251247691 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

74251247691 is a deficient number, since it is larger than the sum of its proper divisors (30509858229).

74251247691 is a wasteful number, since it uses less digits than its factorization.

74251247691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15156506.

The product of its digits is 846720, while the sum is 48.

The spelling of 74251247691 in words is "seventy-four billion, two hundred fifty-one million, two hundred forty-seven thousand, six hundred ninety-one".