61255120172 has 12 divisors (see below), whose sum is σ = 108553378080. Its totient is φ = 30239869296.

The previous prime is 61255120159. The next prime is 61255120207. The reversal of 61255120172 is 27102155216.

61255120172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61255120172² (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 3 ways as a sum of consecutive naturals, for example, 96922343 + ... + 96922974.

It is an arithmetic number, because the mean of its divisors is an integer number (9046114840).

Almost surely, 2^61255120172 is an apocalyptic number.

It is an amenable number.

61255120172 is a deficient number, since it is larger than the sum of its proper divisors (47298257908).

61255120172 is a wasteful number, since it uses less digits than its factorization.

61255120172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193845400 (or 193845398 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

Adding to 61255120172 its reverse (27102155216), we get a palindrome (88357275388).

The spelling of 61255120172 in words is "sixty-one billion, two hundred fifty-five million, one hundred twenty thousand, one hundred seventy-two".