2615640321 has 8 divisors (see below), whose sum is σ = 3985737664. Its totient is φ = 1494651600.

The previous prime is 2615640277. The next prime is 2615640353. The reversal of 2615640321 is 1230465162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2615640321 - 2⁶ = 2615640257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2615640361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62277130 + ... + 62277171.

It is an arithmetic number, because the mean of its divisors is an integer number (498217208).

Almost surely, 2^2615640321 is an apocalyptic number.

2615640321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2615640321 is a deficient number, since it is larger than the sum of its proper divisors (1370097343).

2615640321 is a wasteful number, since it uses less digits than its factorization.

2615640321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124554311.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 2615640321 is about 51143.3311488409. The cubic root of 2615640321 is about 1377.8206026908.

The spelling of 2615640321 in words is "two billion, six hundred fifteen million, six hundred forty thousand, three hundred twenty-one".