1951545607649 has 4 divisors (see below), whose sum is σ = 2128958844720. Its totient is φ = 1774132370580.

The previous prime is 1951545607619. The next prime is 1951545607657. The reversal of 1951545607649 is 9467065451591.

It is a happy number.

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-1951545607649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1951545607591 and 1951545607600.

It is not an unprimeable number, because it can be changed into a prime (1951545607619) 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, 88706618519 + ... + 88706618540.

It is an arithmetic number, because the mean of its divisors is an integer number (532239711180).

Almost surely, 2^{1951545607649} is an apocalyptic number.

It is an amenable number.

1951545607649 is a deficient number, since it is larger than the sum of its proper divisors (177413237071).

1951545607649 is a wasteful number, since it uses less digits than its factorization.

1951545607649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177413237070.

The product of its (nonzero) digits is 40824000, while the sum is 62.

The spelling of 1951545607649 in words is "one trillion, nine hundred fifty-one billion, five hundred forty-five million, six hundred seven thousand, six hundred forty-nine".