8465437561 has 16 divisors (see below), whose sum is σ = 10175321088. Its totient is φ = 6889521600.

The previous prime is 8465437553. The next prime is 8465437609. The reversal of 8465437561 is 1657345648.

It is a cyclic number.

It is not a de Polignac number, because 8465437561 - 2³ = 8465437553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8465437501) 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, 356530 + ... + 379531.

It is an arithmetic number, because the mean of its divisors is an integer number (635957568).

Almost surely, 2^8465437561 is an apocalyptic number.

It is an amenable number.

8465437561 is a deficient number, since it is larger than the sum of its proper divisors (1709883527).

8465437561 is a wasteful number, since it uses less digits than its factorization.

8465437561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736152.

The product of its digits is 2419200, while the sum is 49.

The square root of 8465437561 is about 92007.8124998089. The cubic root of 8465437561 is about 2038.0576765259.

The spelling of 8465437561 in words is "eight billion, four hundred sixty-five million, four hundred thirty-seven thousand, five hundred sixty-one".