551601661515 has 8 divisors (see below), whose sum is σ = 882562658448. Its totient is φ = 294187552800.

The previous prime is 551601661441. The next prime is 551601661517. The reversal of 551601661515 is 515166106155.

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

It is not a de Polignac number, because 551601661515 - 2²³ = 551593272907 is a prime.

It is a super-2 number, since 2×551601661515² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551601661517) 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, 18386722036 + ... + 18386722065.

It is an arithmetic number, because the mean of its divisors is an integer number (110320332306).

Almost surely, 2^551601661515 is an apocalyptic number.

551601661515 is a deficient number, since it is larger than the sum of its proper divisors (330960996933).

551601661515 is a wasteful number, since it uses less digits than its factorization.

551601661515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36773444109.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 551601661515 in words is "five hundred fifty-one billion, six hundred one million, six hundred sixty-one thousand, five hundred fifteen".