1616604551 has 4 divisors (see below), whose sum is σ = 1619007312. Its totient is φ = 1614201792.

The previous prime is 1616604547. The next prime is 1616604553. The reversal of 1616604551 is 1554066161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1616604551 - 2² = 1616604547 is a prime.

It is a super-2 number, since 2×1616604551² = 5226820548627823202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616604553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200371 + ... + 1201716.

It is an arithmetic number, because the mean of its divisors is an integer number (404751828).

Almost surely, 2^1616604551 is an apocalyptic number.

1616604551 is a deficient number, since it is larger than the sum of its proper divisors (2402761).

1616604551 is an equidigital number, since it uses as much as digits as its factorization.

1616604551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402760.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 1616604551 is about 40207.0211654631. The cubic root of 1616604551 is about 1173.6391793110.

The spelling of 1616604551 in words is "one billion, six hundred sixteen million, six hundred four thousand, five hundred fifty-one".