64897681478 has 8 divisors (see below), whose sum is σ = 111253168272. Its totient is φ = 27813292056.

The previous prime is 64897681469. The next prime is 64897681483. The reversal of 64897681478 is 87418679846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64897681478² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2317774325 + ... + 2317774352.

It is an arithmetic number, because the mean of its divisors is an integer number (13906646034).

Almost surely, 2^64897681478 is an apocalyptic number.

64897681478 is a deficient number, since it is larger than the sum of its proper divisors (46355486794).

64897681478 is a wasteful number, since it uses less digits than its factorization.

64897681478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4635548686.

The product of its digits is 130056192, while the sum is 68.

The spelling of 64897681478 in words is "sixty-four billion, eight hundred ninety-seven million, six hundred eighty-one thousand, four hundred seventy-eight".