1655005551 has 8 divisors (see below), whose sum is σ = 2208036864. Its totient is φ = 1102655640.

The previous prime is 1655005529. The next prime is 1655005567. The reversal of 1655005551 is 1555005561.

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

It is not a de Polignac number, because 1655005551 - 2⁷ = 1655005423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655005511) 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, 164655 + ... + 174416.

It is an arithmetic number, because the mean of its divisors is an integer number (276004608).

Almost surely, 2^1655005551 is an apocalyptic number.

1655005551 is a deficient number, since it is larger than the sum of its proper divisors (553031313).

1655005551 is a wasteful number, since it uses less digits than its factorization.

1655005551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340701.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 1655005551 is about 40681.7594383527. The cubic root of 1655005551 is about 1182.8594710678.

The spelling of 1655005551 in words is "one billion, six hundred fifty-five million, five thousand, five hundred fifty-one".