10261777940 has 12 divisors (see below), whose sum is σ = 21549733716. Its totient is φ = 4104711168.

The previous prime is 10261777931. The next prime is 10261777961. The reversal of 10261777940 is 4977716201.

It can be written as a sum of positive squares in 2 ways, for example, as 1302776836 + 8959001104 = 36094^2 + 94652^2 .

It is a junction number, because it is equal to n+sod(n) for n = 10261777891 and 10261777900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256544429 + ... + 256544468.

It is an arithmetic number, because the mean of its divisors is an integer number (1795811143).

Almost surely, 2^10261777940 is an apocalyptic number.

10261777940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10261777940 is an abundant number, since it is smaller than the sum of its proper divisors (11287955776).

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

10261777940 is a wasteful number, since it uses less digits than its factorization.

10261777940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513088906 (or 513088904 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 44.

The spelling of 10261777940 in words is "ten billion, two hundred sixty-one million, seven hundred seventy-seven thousand, nine hundred forty".