61217893507 has 4 divisors (see below), whose sum is σ = 61276814560. Its totient is φ = 61158972456.

The previous prime is 61217893481. The next prime is 61217893519. The reversal of 61217893507 is 70539871216.

It is a happy number.

61217893507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61217893507 is a prime.

It is the 247423-rd Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61217899507) by changing a digit.

It is a nontrivial repunit in base 247422.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29458968 + ... + 29461045.

It is an arithmetic number, because the mean of its divisors is an integer number (15319203640).

Almost surely, 2^61217893507 is an apocalyptic number.

61217893507 is a deficient number, since it is larger than the sum of its proper divisors (58921053).

61217893507 is a wasteful number, since it uses less digits than its factorization.

61217893507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58921052.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 61217893507 in words is "sixty-one billion, two hundred seventeen million, eight hundred ninety-three thousand, five hundred seven".