40777020981 has 48 divisors (see below), whose sum is σ = 66297666240. Its totient is φ = 23998809600.

The previous prime is 40777020979. The next prime is 40777020989. The reversal of 40777020981 is 18902077704.

It is a happy number.

It is not a de Polignac number, because 40777020981 - 2¹ = 40777020979 is a prime.

It is a super-2 number, since 2×40777020981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40777020989) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224166 + ... + 363048.

It is an arithmetic number, because the mean of its divisors is an integer number (1381201380).

Almost surely, 2^40777020981 is an apocalyptic number.

It is an amenable number.

40777020981 is a deficient number, since it is larger than the sum of its proper divisors (25520645259).

40777020981 is a wasteful number, since it uses less digits than its factorization.

40777020981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139026 (or 139023 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The spelling of 40777020981 in words is "forty billion, seven hundred seventy-seven million, twenty thousand, nine hundred eighty-one".