120811545640 has 32 divisors (see below), whose sum is σ = 275549627880. Its totient is φ = 47662636032.

The previous prime is 120811545587. The next prime is 120811545641. The reversal of 120811545640 is 46545118021.

It can be written as a sum of positive squares in 4 ways, for example, as 80873121924 + 39938423716 = 284382^2 + 199846^2 .

It is a super-4 number, since 4×120811545640⁴ (a number of 45 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 120811545640.

It is not an unprimeable number, because it can be changed into a prime (120811545641) 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, 20683989 + ... + 20689828.

Almost surely, 2^120811545640 is an apocalyptic number.

120811545640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120811545640 is an abundant number, since it is smaller than the sum of its proper divisors (154738082240).

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

120811545640 is a wasteful number, since it uses less digits than its factorization.

120811545640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41373901 (or 41373897 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 120811545640 in words is "one hundred twenty billion, eight hundred eleven million, five hundred forty-five thousand, six hundred forty".