72515121370 has 8 divisors (see below), whose sum is σ = 130527218484. Its totient is φ = 29006048544.

The previous prime is 72515121359. The next prime is 72515121379. The reversal of 72515121370 is 7312151527.

It can be written as a sum of positive squares in 2 ways, for example, as 71531107209 + 984014161 = 267453^2 + 31369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (72515121379) 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, 3625756059 + ... + 3625756078.

Almost surely, 2^72515121370 is an apocalyptic number.

72515121370 is a deficient number, since it is larger than the sum of its proper divisors (58012097114).

72515121370 is a wasteful number, since it uses less digits than its factorization.

72515121370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251512144.

The product of its (nonzero) digits is 14700, while the sum is 34.

Adding to 72515121370 its reverse (7312151527), we get a palindrome (79827272897).

The spelling of 72515121370 in words is "seventy-two billion, five hundred fifteen million, one hundred twenty-one thousand, three hundred seventy".