7551665801 has 4 divisors (see below), whose sum is σ = 7812068100. Its totient is φ = 7291263504.

The previous prime is 7551665789. The next prime is 7551665819. The reversal of 7551665801 is 1085661557.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1455804025 + 6095861776 = 38155^2 + 78076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7551665801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7551665101) 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, 130201106 + ... + 130201163.

It is an arithmetic number, because the mean of its divisors is an integer number (1953017025).

Almost surely, 2^7551665801 is an apocalyptic number.

It is an amenable number.

7551665801 is a deficient number, since it is larger than the sum of its proper divisors (260402299).

7551665801 is a wasteful number, since it uses less digits than its factorization.

7551665801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260402298.

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 7551665801 is about 86900.3210638488. The cubic root of 7551665801 is about 1961.9183114690.

The spelling of 7551665801 in words is "seven billion, five hundred fifty-one million, six hundred sixty-five thousand, eight hundred one".