64416781087 has 4 divisors (see below), whose sum is σ = 65007760840. Its totient is φ = 63825801336.

The previous prime is 64416781069. The next prime is 64416781127. The reversal of 64416781087 is 78018761446.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64416781087 is a prime.

It is a super-2 number, since 2×64416781087² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64416781787) 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, 295489713 + ... + 295489930.

It is an arithmetic number, because the mean of its divisors is an integer number (16251940210).

Almost surely, 2^64416781087 is an apocalyptic number.

64416781087 is a deficient number, since it is larger than the sum of its proper divisors (590979753).

64416781087 is a wasteful number, since it uses less digits than its factorization.

64416781087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590979752.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 64416781087 in words is "sixty-four billion, four hundred sixteen million, seven hundred eighty-one thousand, eighty-seven".