1551165605 has 16 divisors (see below), whose sum is σ = 2137492800. Its totient is φ = 1068744960.

The previous prime is 1551165599. The next prime is 1551165607. The reversal of 1551165605 is 5065611551.

It is not a de Polignac number, because 1551165605 - 2²⁰ = 1550117029 is a prime.

It is a super-2 number, since 2×1551165605² = 4812229468270032050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551165607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 741140 + ... + 743229.

It is an arithmetic number, because the mean of its divisors is an integer number (133593300).

Almost surely, 2^1551165605 is an apocalyptic number.

It is an amenable number.

1551165605 is a deficient number, since it is larger than the sum of its proper divisors (586327195).

1551165605 is a wasteful number, since it uses less digits than its factorization.

1551165605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484404.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 1551165605 is about 39384.8397863950. The cubic root of 1551165605 is about 1157.5845509814.

The spelling of 1551165605 in words is "one billion, five hundred fifty-one million, one hundred sixty-five thousand, six hundred five".