61520216172 has 24 divisors (see below), whose sum is σ = 143602096176. Its totient is φ = 20498892288.

The previous prime is 61520216123. The next prime is 61520216189. The reversal of 61520216172 is 27161202516.

It is a super-2 number, since 2×61520216172² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948093 + ... + 1010900.

It is an arithmetic number, because the mean of its divisors is an integer number (5983420674).

Almost surely, 2^61520216172 is an apocalyptic number.

It is an amenable number.

61520216172 is an abundant number, since it is smaller than the sum of its proper divisors (82081880004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61520216172 is a wasteful number, since it uses less digits than its factorization.

61520216172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961617 (or 1961615 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 61520216172 its reverse (27161202516), we get a palindrome (88681418688).

The spelling of 61520216172 in words is "sixty-one billion, five hundred twenty million, two hundred sixteen thousand, one hundred seventy-two".