6401551247 has 24 divisors (see below), whose sum is σ = 8139274416. Its totient is φ = 4989333888.

The previous prime is 6401551223. The next prime is 6401551267. The reversal of 6401551247 is 7421551046.

It is not a de Polignac number, because 6401551247 - 2⁶ = 6401551183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401551217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32318 + ... + 117675.

It is an arithmetic number, because the mean of its divisors is an integer number (339136434).

Almost surely, 2^6401551247 is an apocalyptic number.

6401551247 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

6401551247 is a deficient number, since it is larger than the sum of its proper divisors (1737723169).

6401551247 is a wasteful number, since it uses less digits than its factorization.

6401551247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150087 (or 150080 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 6401551247 is about 80009.6947063292. The cubic root of 6401551247 is about 1856.7855265512.

The spelling of 6401551247 in words is "six billion, four hundred one million, five hundred fifty-one thousand, two hundred forty-seven".