40154695978 has 4 divisors (see below), whose sum is σ = 60232043970. Its totient is φ = 20077347988.

The previous prime is 40154695949. The next prime is 40154695991. The reversal of 40154695978 is 87959645104.

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

It can be written as a sum of positive squares in only one way, i.e., 35597500929 + 4557195049 = 188673^2 + 67507^2 .

It is a super-2 number, since 2×40154695978² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10038673993 + ... + 10038673996.

Almost surely, 2^40154695978 is an apocalyptic number.

40154695978 is a deficient number, since it is larger than the sum of its proper divisors (20077347992).

40154695978 is a wasteful number, since it uses less digits than its factorization.

40154695978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20077347991.

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 40154695978 in words is "forty billion, one hundred fifty-four million, six hundred ninety-five thousand, nine hundred seventy-eight".