1616521500551 has 4 divisors (see below), whose sum is σ = 1627226941104. Its totient is φ = 1605816060000.

The previous prime is 1616521500547. The next prime is 1616521500571. The reversal of 1616521500551 is 1550051256161.

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 1616521500551 - 2² = 1616521500547 is a prime.

It is a super-2 number, since 2×1616521500551² (a number of 25 digits) 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 (1616521500521) 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, 5352720050 + ... + 5352720351.

It is an arithmetic number, because the mean of its divisors is an integer number (406806735276).

Almost surely, 2^{1616521500551} is an apocalyptic number.

1616521500551 is a deficient number, since it is larger than the sum of its proper divisors (10705440553).

1616521500551 is a wasteful number, since it uses less digits than its factorization.

1616521500551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10705440552.

The product of its (nonzero) digits is 45000, while the sum is 38.

The spelling of 1616521500551 in words is "one trillion, six hundred sixteen billion, five hundred twenty-one million, five hundred thousand, five hundred fifty-one".