1200537855641 has 4 divisors (see below), whose sum is σ = 1200540214272. Its totient is φ = 1200535497012.

The previous prime is 1200537855557. The next prime is 1200537855661. The reversal of 1200537855641 is 1465587350021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200537855641 is a prime.

It is a super-2 number, since 2×1200537855641² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200537855661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64601 + ... + 1550886.

It is an arithmetic number, because the mean of its divisors is an integer number (300135053568).

Almost surely, 2^{1200537855641} is an apocalyptic number.

It is an amenable number.

1200537855641 is a deficient number, since it is larger than the sum of its proper divisors (2358631).

1200537855641 is an equidigital number, since it uses as much as digits as its factorization.

1200537855641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358630.

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 1200537855641 in words is "one trillion, two hundred billion, five hundred thirty-seven million, eight hundred fifty-five thousand, six hundred forty-one".