1649772641 has 8 divisors (see below), whose sum is σ = 1894476000. Its totient is φ = 1420856640.

The previous prime is 1649772617. The next prime is 1649772647. The reversal of 1649772641 is 1462779461.

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 1649772641 - 2¹⁴ = 1649756257 is a prime.

It is a super-2 number, since 2×1649772641² = 5443499533984229762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649772647) 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, 3946616 + ... + 3947033.

It is an arithmetic number, because the mean of its divisors is an integer number (236809500).

Almost surely, 2^1649772641 is an apocalyptic number.

1649772641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1649772641 is a deficient number, since it is larger than the sum of its proper divisors (244703359).

1649772641 is a wasteful number, since it uses less digits than its factorization.

1649772641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7893679.

The product of its digits is 508032, while the sum is 47.

The square root of 1649772641 is about 40617.3933309364. The cubic root of 1649772641 is about 1181.6114727535.

The spelling of 1649772641 in words is "one billion, six hundred forty-nine million, seven hundred seventy-two thousand, six hundred forty-one".