61550015213 has 4 divisors (see below), whose sum is σ = 61605818688. Its totient is φ = 61494211740.

The previous prime is 61550015201. The next prime is 61550015231. The reversal of 61550015213 is 31251005516.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61550015213 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 (61550015113) 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, 27900083 + ... + 27902288.

It is an arithmetic number, because the mean of its divisors is an integer number (15401454672).

Almost surely, 2^61550015213 is an apocalyptic number.

It is an amenable number.

61550015213 is a deficient number, since it is larger than the sum of its proper divisors (55803475).

61550015213 is a wasteful number, since it uses less digits than its factorization.

61550015213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55803474.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 61550015213 in words is "sixty-one billion, five hundred fifty million, fifteen thousand, two hundred thirteen".