64140551 has 4 divisors (see below), whose sum is σ = 64377504. Its totient is φ = 63903600.

The previous prime is 64140539. The next prime is 64140631. The reversal of 64140551 is 15504146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64140551 - 2¹⁴ = 64124167 is a prime.

It is a super-2 number, since 2×64140551² = 8228020565167202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64140551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64143551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118070 + ... + 118611.

It is an arithmetic number, because the mean of its divisors is an integer number (16094376).

Almost surely, 2^64140551 is an apocalyptic number.

64140551 is a deficient number, since it is larger than the sum of its proper divisors (236953).

64140551 is a wasteful number, since it uses less digits than its factorization.

64140551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236952.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 64140551 is about 8008.7796198922. The cubic root of 64140551 is about 400.2926004935.

Adding to 64140551 its reverse (15504146), we get a palindrome (79644697).

The spelling of 64140551 in words is "sixty-four million, one hundred forty thousand, five hundred fifty-one".