1640148390678 has 64 divisors (see below), whose sum is σ = 3783833856000. Its totient is φ = 464249625984.

The previous prime is 1640148390637. The next prime is 1640148390679. The reversal of 1640148390678 is 8760938410461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640148390679) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39482803 + ... + 39524321.

It is an arithmetic number, because the mean of its divisors is an integer number (59122404000).

Almost surely, 2^{1640148390678} is an apocalyptic number.

1640148390678 is an abundant number, since it is smaller than the sum of its proper divisors (2143685465322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640148390678 is a wasteful number, since it uses less digits than its factorization.

1640148390678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50269.

The product of its (nonzero) digits is 6967296, while the sum is 57.

The spelling of 1640148390678 in words is "one trillion, six hundred forty billion, one hundred forty-eight million, three hundred ninety thousand, six hundred seventy-eight".