61881669215 has 16 divisors (see below), whose sum is σ = 74998018368. Its totient is φ = 49012237056.

The previous prime is 61881669203. The next prime is 61881669217. The reversal of 61881669215 is 51296618816.

It is a cyclic number.

It is not a de Polignac number, because 61881669215 - 2¹² = 61881665119 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 (61881669217) 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, 2375099 + ... + 2401011.

It is an arithmetic number, because the mean of its divisors is an integer number (4687376148).

Almost surely, 2^61881669215 is an apocalyptic number.

61881669215 is a deficient number, since it is larger than the sum of its proper divisors (13116349153).

61881669215 is a wasteful number, since it uses less digits than its factorization.

61881669215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30658.

The product of its digits is 1244160, while the sum is 53.

The spelling of 61881669215 in words is "sixty-one billion, eight hundred eighty-one million, six hundred sixty-nine thousand, two hundred fifteen".