61507220189 has 8 divisors (see below), whose sum is σ = 61671197880. Its totient is φ = 61343296000.

The previous prime is 61507220171. The next prime is 61507220191. The reversal of 61507220189 is 98102270516.

It can be written as a sum of positive squares in 4 ways, for example, as 28571140900 + 32936079289 = 169030^2 + 181483^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61507220189 - 2²⁴ = 61490442973 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 (61507220119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3472247 + ... + 3489915.

It is an arithmetic number, because the mean of its divisors is an integer number (7708899735).

Almost surely, 2^61507220189 is an apocalyptic number.

It is an amenable number.

61507220189 is a deficient number, since it is larger than the sum of its proper divisors (163977691).

61507220189 is a wasteful number, since it uses less digits than its factorization.

61507220189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26751.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 61507220189 in words is "sixty-one billion, five hundred seven million, two hundred twenty thousand, one hundred eighty-nine".