1220766251550 has 24 divisors (see below), whose sum is σ = 3027500304216. Its totient is φ = 325537667040.

The previous prime is 1220766251539. The next prime is 1220766251567. The reversal of 1220766251550 is 551526670221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4069220689 + ... + 4069220988.

It is an arithmetic number, because the mean of its divisors is an integer number (126145846009).

Almost surely, 2^{1220766251550} is an apocalyptic number.

1220766251550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220766251550 is an abundant number, since it is smaller than the sum of its proper divisors (1806734052666).

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

1220766251550 is a wasteful number, since it uses less digits than its factorization.

1220766251550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8138441692 (or 8138441687 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 1220766251550 in words is "one trillion, two hundred twenty billion, seven hundred sixty-six million, two hundred fifty-one thousand, five hundred fifty".