61198995405 has 16 divisors (see below), whose sum is σ = 97921572480. Its totient is φ = 32638404288.

The previous prime is 61198995379. The next prime is 61198995443. The reversal of 61198995405 is 50459989116.

It is not a de Polignac number, because 61198995405 - 2⁸ = 61198995149 is a prime.

It is a super-2 number, since 2×61198995405² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 688279 + ... + 772091.

It is an arithmetic number, because the mean of its divisors is an integer number (6120098280).

Almost surely, 2^61198995405 is an apocalyptic number.

It is an amenable number.

61198995405 is a deficient number, since it is larger than the sum of its proper divisors (36722577075).

61198995405 is a wasteful number, since it uses less digits than its factorization.

61198995405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132500.

The product of its (nonzero) digits is 3499200, while the sum is 57.

The spelling of 61198995405 in words is "sixty-one billion, one hundred ninety-eight million, nine hundred ninety-five thousand, four hundred five".