2615121640 has 16 divisors (see below), whose sum is σ = 5884023780. Its totient is φ = 1046048640.

The previous prime is 2615121547. The next prime is 2615121671. The reversal of 2615121640 is 461215162.

It can be written as a sum of positive squares in 2 ways, for example, as 2373443524 + 241678116 = 48718^2 + 15546^2 .

It is a super-2 number, since 2×2615121640² = 13677722383992579200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2615121599 and 2615121608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32688981 + ... + 32689060.

Almost surely, 2^2615121640 is an apocalyptic number.

2615121640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2615121640 is an abundant number, since it is smaller than the sum of its proper divisors (3268902140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2615121640 is a wasteful number, since it uses less digits than its factorization.

2615121640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65378052 (or 65378048 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2615121640 is about 51138.2600407953. The cubic root of 2615121640 is about 1377.7295228118.

The spelling of 2615121640 in words is "two billion, six hundred fifteen million, one hundred twenty-one thousand, six hundred forty".