61404555641 has 16 divisors (see below), whose sum is σ = 72154877760. Its totient is φ = 51517398720.

The previous prime is 61404555637. The next prime is 61404555643. The reversal of 61404555641 is 14655540416.

It is a cyclic number.

It is not a de Polignac number, because 61404555641 - 2² = 61404555637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61404555643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 672515 + ... + 758343.

It is an arithmetic number, because the mean of its divisors is an integer number (4509679860).

Almost surely, 2^61404555641 is an apocalyptic number.

It is an amenable number.

61404555641 is a deficient number, since it is larger than the sum of its proper divisors (10750322119).

61404555641 is a wasteful number, since it uses less digits than its factorization.

61404555641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90856.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 61404555641 in words is "sixty-one billion, four hundred four million, five hundred fifty-five thousand, six hundred forty-one".