6401335515 has 16 divisors (see below), whose sum is σ = 10247923968. Its totient is φ = 3412116576.

The previous prime is 6401335487. The next prime is 6401335517. The reversal of 6401335515 is 5155331046.

It is not a de Polignac number, because 6401335515 - 2³² = 2106368219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6401335517) 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, 92929 + ... + 146418.

It is an arithmetic number, because the mean of its divisors is an integer number (640495248).

Almost surely, 2^6401335515 is an apocalyptic number.

6401335515 is a deficient number, since it is larger than the sum of its proper divisors (3846588453).

6401335515 is a wasteful number, since it uses less digits than its factorization.

6401335515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241138.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 6401335515 is about 80008.3465333461. The cubic root of 6401335515 is about 1856.7646684530.

The spelling of 6401335515 in words is "six billion, four hundred one million, three hundred thirty-five thousand, five hundred fifteen".