1201955897620 has 24 divisors (see below), whose sum is σ = 2524416638688. Its totient is φ = 480723453600.

The previous prime is 1201955897617. The next prime is 1201955897627. The reversal of 1201955897620 is 267985591021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201955897627) 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, 3514086 + ... + 3840925.

It is an arithmetic number, because the mean of its divisors is an integer number (105184026612).

Almost surely, 2^{1201955897620} is an apocalyptic number.

1201955897620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201955897620 is an abundant number, since it is smaller than the sum of its proper divisors (1322460741068).

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

1201955897620 is a wasteful number, since it uses less digits than its factorization.

1201955897620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7363191 (or 7363189 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 1201955897620 in words is "one trillion, two hundred one billion, nine hundred fifty-five million, eight hundred ninety-seven thousand, six hundred twenty".