61894055421 has 24 divisors (see below), whose sum is σ = 101142254304. Its totient is φ = 37511547120.

The previous prime is 61894055411. The next prime is 61894055449. The reversal of 61894055421 is 12455049816.

61894055421 is a `hidden beast` number, since 6 + 1 + 8 + 94 + 0 + 554 + 2 + 1 = 666.

It is not a de Polignac number, because 61894055421 - 2¹⁴ = 61894039037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61894055411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11574966 + ... + 11580311.

It is an arithmetic number, because the mean of its divisors is an integer number (4214260596).

Almost surely, 2^61894055421 is an apocalyptic number.

It is an amenable number.

61894055421 is a deficient number, since it is larger than the sum of its proper divisors (39248198883).

61894055421 is a wasteful number, since it uses less digits than its factorization.

61894055421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23155303 (or 23155291 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 61894055421 in words is "sixty-one billion, eight hundred ninety-four million, fifty-five thousand, four hundred twenty-one".