991355441212245 has 16 divisors (see below), whose sum is σ = 1586826594303552. Its totient is φ = 528503605858560.

The previous prime is 991355441212231. The next prime is 991355441212259. The reversal of 991355441212245 is 542212144553199.

It is an interprime number because it is at equal distance from previous prime (991355441212231) and next prime (991355441212259).

It is not a de Polignac number, because 991355441212245 - 2¹³ = 991355441204053 is a prime.

It is a super-2 number, since 2×991355441212245² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13705970212 + ... + 13706042541.

It is an arithmetic number, because the mean of its divisors is an integer number (99176662143972).

Almost surely, 2^{991355441212245} is an apocalyptic number.

It is an amenable number.

991355441212245 is a deficient number, since it is larger than the sum of its proper divisors (595471153091307).

991355441212245 is a wasteful number, since it uses less digits than its factorization.

991355441212245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27412015172.

The product of its digits is 15552000, while the sum is 57.

The spelling of 991355441212245 in words is "nine hundred ninety-one trillion, three hundred fifty-five billion, four hundred forty-one million, two hundred twelve thousand, two hundred forty-five".