1551060665 has 32 divisors (see below), whose sum is σ = 2395422720. Its totient is φ = 935697600.

The previous prime is 1551060661. The next prime is 1551060691. The reversal of 1551060665 is 5660601551.

It is not a de Polignac number, because 1551060665 - 2² = 1551060661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1551060661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53045 + ... + 76914.

It is an arithmetic number, because the mean of its divisors is an integer number (74856960).

Almost surely, 2^1551060665 is an apocalyptic number.

It is an amenable number.

1551060665 is a deficient number, since it is larger than the sum of its proper divisors (844362055).

1551060665 is a wasteful number, since it uses less digits than its factorization.

1551060665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130013.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1551060665 is about 39383.5075253589. The cubic root of 1551060665 is about 1157.5584459539.

The spelling of 1551060665 in words is "one billion, five hundred fifty-one million, sixty thousand, six hundred sixty-five".