72154165507 has 4 divisors (see below), whose sum is σ = 73832169400. Its totient is φ = 70476161616.

The previous prime is 72154165477. The next prime is 72154165511. The reversal of 72154165507 is 70556145127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72154165507 - 2⁷ = 72154165379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1678003849 = 72154165507 / (7 + 2 + 1 + 5 + 4 + 1 + 6 + 5 + 5 + 0 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72154165207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839001882 + ... + 839001967.

It is an arithmetic number, because the mean of its divisors is an integer number (18458042350).

Almost surely, 2^72154165507 is an apocalyptic number.

72154165507 is a deficient number, since it is larger than the sum of its proper divisors (1678003893).

72154165507 is a wasteful number, since it uses less digits than its factorization.

72154165507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678003892.

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 72154165507 in words is "seventy-two billion, one hundred fifty-four million, one hundred sixty-five thousand, five hundred seven".