61778517295 has 16 divisors (see below), whose sum is σ = 80999517312. Its totient is φ = 44859929760.

The previous prime is 61778517277. The next prime is 61778517299. The reversal of 61778517295 is 59271587716.

It is not a de Polignac number, because 61778517295 - 2⁵ = 61778517263 is a prime.

It is a super-2 number, since 2×61778517295² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61778517299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 838077 + ... + 908806.

It is an arithmetic number, because the mean of its divisors is an integer number (5062469832).

Almost surely, 2^61778517295 is an apocalyptic number.

61778517295 is a deficient number, since it is larger than the sum of its proper divisors (19221000017).

61778517295 is a wasteful number, since it uses less digits than its factorization.

61778517295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747542.

The product of its digits is 7408800, while the sum is 58.

The spelling of 61778517295 in words is "sixty-one billion, seven hundred seventy-eight million, five hundred seventeen thousand, two hundred ninety-five".