1220415640261 has 8 divisors (see below), whose sum is σ = 1284704445920. Its totient is φ = 1156132474992.

The previous prime is 1220415640259. The next prime is 1220415640273. The reversal of 1220415640261 is 1620465140221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220415640261 - 2¹ = 1220415640259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220415640361) 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, 962310 + ... + 1834903.

It is an arithmetic number, because the mean of its divisors is an integer number (160588055740).

Almost surely, 2^{1220415640261} is an apocalyptic number.

It is an amenable number.

1220415640261 is a deficient number, since it is larger than the sum of its proper divisors (64288805659).

1220415640261 is a wasteful number, since it uses less digits than its factorization.

1220415640261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820195.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 1220415640261 in words is "one trillion, two hundred twenty billion, four hundred fifteen million, six hundred forty thousand, two hundred sixty-one".