64120551 has 16 divisors (see below), whose sum is σ = 94849920. Its totient is φ = 38201120.

The previous prime is 64120477. The next prime is 64120601. The reversal of 64120551 is 15502146.

It is a cyclic number.

It is not a de Polignac number, because 64120551 - 2¹⁰ = 64119527 is a prime.

It is a super-2 number, since 2×64120551² = 8222890121087202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64120051) 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, 14520 + ... + 18413.

It is an arithmetic number, because the mean of its divisors is an integer number (5928120).

Almost surely, 2^64120551 is an apocalyptic number.

64120551 is a deficient number, since it is larger than the sum of its proper divisors (30729369).

64120551 is a wasteful number, since it uses less digits than its factorization.

64120551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33006.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 64120551 is about 8007.5308928533. The cubic root of 64120551 is about 400.2509903933.

Adding to 64120551 its reverse (15502146), we get a palindrome (79622697).

The spelling of 64120551 in words is "sixty-four million, one hundred twenty thousand, five hundred fifty-one".