61786451678 has 8 divisors (see below), whose sum is σ = 105919631472. Its totient is φ = 26479907856.

The previous prime is 61786451653. The next prime is 61786451681. The reversal of 61786451678 is 87615468716.

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

It is a super-2 number, since 2×61786451678² (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 3 ways as a sum of consecutive naturals, for example, 2206658975 + ... + 2206659002.

It is an arithmetic number, because the mean of its divisors is an integer number (13239953934).

Almost surely, 2^61786451678 is an apocalyptic number.

61786451678 is a deficient number, since it is larger than the sum of its proper divisors (44133179794).

61786451678 is a wasteful number, since it uses less digits than its factorization.

61786451678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4413317986.

The product of its digits is 13547520, while the sum is 59.

The spelling of 61786451678 in words is "sixty-one billion, seven hundred eighty-six million, four hundred fifty-one thousand, six hundred seventy-eight".