8581611551 has 16 divisors (see below), whose sum is σ = 8772349248. Its totient is φ = 8393376000.

The previous prime is 8581611541. The next prime is 8581611587. The reversal of 8581611551 is 1551161858.

It is a cyclic number.

It is not a de Polignac number, because 8581611551 - 2¹⁴ = 8581595167 is a prime.

It is a super-4 number, since 4×8581611551⁴ (a number of 41 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8581611499 and 8581611508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8581611541) 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, 5793731 + ... + 5795211.

It is an arithmetic number, because the mean of its divisors is an integer number (548271828).

Almost surely, 2^8581611551 is an apocalyptic number.

8581611551 is a deficient number, since it is larger than the sum of its proper divisors (190737697).

8581611551 is a wasteful number, since it uses less digits than its factorization.

8581611551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242.

The product of its digits is 48000, while the sum is 41.

The square root of 8581611551 is about 92636.9880285407. The cubic root of 8581611551 is about 2047.3383303806.

The spelling of 8581611551 in words is "eight billion, five hundred eighty-one million, six hundred eleven thousand, five hundred fifty-one".