46635951978 has 144 divisors (see below), whose sum is σ = 133802974656. Its totient is φ = 11586516480.

The previous prime is 46635951931. The next prime is 46635951997. The reversal of 46635951978 is 87915953664.

46635951978 is a `hidden beast` number, since 4 + 6 + 63 + 59 + 519 + 7 + 8 = 666.

It is a super-2 number, since 2×46635951978² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 118650 + ... + 327642.

It is an arithmetic number, because the mean of its divisors is an integer number (929187324).

Almost surely, 2^46635951978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 46635951978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66901487328).

46635951978 is an abundant number, since it is smaller than the sum of its proper divisors (87167022678).

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

46635951978 is a wasteful number, since it uses less digits than its factorization.

46635951978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209049 (or 209039 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 46635951978 in words is "forty-six billion, six hundred thirty-five million, nine hundred fifty-one thousand, nine hundred seventy-eight".