61951589191 has 16 divisors (see below), whose sum is σ = 64305561600. Its totient is φ = 59620426560.

The previous prime is 61951589179. The next prime is 61951589201. The reversal of 61951589191 is 19198515916.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61951589191 - 2⁹ = 61951588679 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 (61951589111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7247466 + ... + 7256008.

It is an arithmetic number, because the mean of its divisors is an integer number (4019097600).

Almost surely, 2^61951589191 is an apocalyptic number.

61951589191 is a deficient number, since it is larger than the sum of its proper divisors (2353972409).

61951589191 is a wasteful number, since it uses less digits than its factorization.

61951589191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9846.

The product of its digits is 874800, while the sum is 55.

The spelling of 61951589191 in words is "sixty-one billion, nine hundred fifty-one million, five hundred eighty-nine thousand, one hundred ninety-one".