61578469698 has 8 divisors (see below), whose sum is σ = 123156939408. Its totient is φ = 20526156564.

The previous prime is 61578469681. The next prime is 61578469699. The reversal of 61578469698 is 89696487516.

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

61578469698 is an admirable number.

It is a super-2 number, since 2×61578469698² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61578469699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5131539136 + ... + 5131539147.

It is an arithmetic number, because the mean of its divisors is an integer number (15394617426).

Almost surely, 2^61578469698 is an apocalyptic number.

61578469698 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61578469698 is a wasteful number, since it uses less digits than its factorization.

61578469698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10263078288.

The product of its digits is 156764160, while the sum is 69.

The spelling of 61578469698 in words is "sixty-one billion, five hundred seventy-eight million, four hundred sixty-nine thousand, six hundred ninety-eight".