646532671377 has 8 divisors (see below), whose sum is σ = 862107532416. Its totient is φ = 430989795632.

The previous prime is 646532671249. The next prime is 646532671409. The reversal of 646532671377 is 773176235646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 646532671377 - 2⁷ = 646532671249 is a prime.

It is a super-2 number, since 2×646532671377² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646532671777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7949118 + ... + 8030039.

It is an arithmetic number, because the mean of its divisors is an integer number (107763441552).

Almost surely, 2^646532671377 is an apocalyptic number.

It is an amenable number.

646532671377 is a deficient number, since it is larger than the sum of its proper divisors (215574861039).

646532671377 is a wasteful number, since it uses less digits than its factorization.

646532671377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15992647.

The product of its digits is 26671680, while the sum is 57.

The spelling of 646532671377 in words is "six hundred forty-six billion, five hundred thirty-two million, six hundred seventy-one thousand, three hundred seventy-seven".