61221048517 has 4 divisors (see below), whose sum is σ = 61237857280. Its totient is φ = 61204239756.

The previous prime is 61221048509. The next prime is 61221048557. The reversal of 61221048517 is 71584012216.

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 not a de Polignac number, because 61221048517 - 2³ = 61221048509 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 (61221048557) 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, 8398917 + ... + 8406202.

It is an arithmetic number, because the mean of its divisors is an integer number (15309464320).

Almost surely, 2^61221048517 is an apocalyptic number.

It is an amenable number.

61221048517 is a deficient number, since it is larger than the sum of its proper divisors (16808763).

61221048517 is a wasteful number, since it uses less digits than its factorization.

61221048517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16808762.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 61221048517 in words is "sixty-one billion, two hundred twenty-one million, forty-eight thousand, five hundred seventeen".