55401681 has 8 divisors (see below), whose sum is σ = 76251904. Its totient is φ = 35742960.

The previous prime is 55401677. The next prime is 55401721. The reversal of 55401681 is 18610455.

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

It is not a de Polignac number, because 55401681 - 2² = 55401677 is a prime.

It is a super-2 number, since 2×55401681² = 6138692515251522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55401601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297766 + ... + 297951.

It is an arithmetic number, because the mean of its divisors is an integer number (9531488).

Almost surely, 2^55401681 is an apocalyptic number.

It is an amenable number.

55401681 is a deficient number, since it is larger than the sum of its proper divisors (20850223).

55401681 is a wasteful number, since it uses less digits than its factorization.

55401681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595751.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 55401681 is about 7443.2305486260. The cubic root of 55401681 is about 381.2188036464.

The spelling of 55401681 in words is "fifty-five million, four hundred one thousand, six hundred eighty-one".