72865405157 has 4 divisors (see below), whose sum is σ = 72914016000. Its totient is φ = 72816794316.

The previous prime is 72865405121. The next prime is 72865405183. The reversal of 72865405157 is 75150456827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75150456827 = 29 ⋅2591395063.

It is a cyclic number.

It is not a de Polignac number, because 72865405157 - 2¹² = 72865401061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72865465157) 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, 24303173 + ... + 24306170.

It is an arithmetic number, because the mean of its divisors is an integer number (18228504000).

Almost surely, 2^72865405157 is an apocalyptic number.

It is an amenable number.

72865405157 is a deficient number, since it is larger than the sum of its proper divisors (48610843).

72865405157 is a wasteful number, since it uses less digits than its factorization.

72865405157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48610842.

The product of its (nonzero) digits is 2352000, while the sum is 50.

The spelling of 72865405157 in words is "seventy-two billion, eight hundred sixty-five million, four hundred five thousand, one hundred fifty-seven".